You must have very expensive utilitiy rates
Yes, indeed, we pay a lot more than 6 cents in Germany. We were coming down from 25 Eurocents in the 90s for industrial use by the way. Now, after deregulation we are at something between 10 and 20 Eurocents plus 16% VAT.
I used 15 Eurocents plus VAT and 50 Watts for average power consumption of CPU. In four years at 200 days at eight hours this adds up to 56 Euros. Which is what an AthlonXP 2000+ is for sale.
K.